build(deps): bump postcss from 8.5.6 to 8.5.12 in the security-updates group across 1 directory (#1107)

Bumps the security-updates group with 1 update in the /docs directory:
[postcss](https://github.com/postcss/postcss).

Updates `postcss` from 8.5.6 to 8.5.12
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/postcss/releases">postcss's
releases</a>.</em></p>
<blockquote>
<h2>8.5.12</h2>
<ul>
<li>Fixed reading any file via user-generated CSS.</li>
<li>Added <code>opts.unsafeMap</code> to disable checks.</li>
</ul>
<h2>8.5.11</h2>
<ul>
<li>Fixed nested brackets parsing performance (by <a
href="https://github.com/offset"><code>@​offset</code></a>).</li>
</ul>
<h2>8.5.10</h2>
<ul>
<li>Fixed XSS via unescaped <code>&lt;/style&gt;</code> in non-bundler
cases (by <a
href="https://github.com/TharVid"><code>@​TharVid</code></a>).</li>
</ul>
<h2>8.5.9</h2>
<ul>
<li>Speed up source map encoding paring in case of the error.</li>
</ul>
<h2>8.5.8</h2>
<ul>
<li>Fixed <code>Processor#version</code>.</li>
</ul>
<h2>8.5.7</h2>
<ul>
<li>Improved source map annotation cleaning performance (by CodeAnt
AI).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/postcss/postcss/blob/main/CHANGELOG.md">postcss's
changelog</a>.</em></p>
<blockquote>
<h2>8.5.12</h2>
<ul>
<li>Fixed reading any file via user-generated CSS.</li>
<li>Added <code>opts.unsafeMap</code> to disable checks.</li>
</ul>
<h2>8.5.11</h2>
<ul>
<li>Fixed nested brackets parsing performance (by <a
href="https://github.com/offset"><code>@​offset</code></a>).</li>
</ul>
<h2>8.5.10</h2>
<ul>
<li>Fixed XSS via unescaped <code>&lt;/style&gt;</code> in non-bundler
cases (by <a
href="https://github.com/TharVid"><code>@​TharVid</code></a>).</li>
</ul>
<h2>8.5.9</h2>
<ul>
<li>Speed up source map encoding paring in case of the error.</li>
</ul>
<h2>8.5.8</h2>
<ul>
<li>Fixed <code>Processor#version</code>.</li>
</ul>
<h2>8.5.7</h2>
<ul>
<li>Improved source map annotation cleaning performance (by CodeAnt
AI).</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/postcss/postcss/commit/9bc81c48f054a630c9a2e3868263b7ad4fc15013"><code>9bc81c4</code></a>
Release 8.5.12 version</li>
<li><a
href="https://github.com/postcss/postcss/commit/85c4d7dab830be366f8a96047f9e5b7944e101d8"><code>85c4d7d</code></a>
Another try to fix coverage</li>
<li><a
href="https://github.com/postcss/postcss/commit/94484cae6d4308167939f2ac888d166bd80dff01"><code>94484ca</code></a>
Try to fix coverage</li>
<li><a
href="https://github.com/postcss/postcss/commit/c64b7488d2731dfa16213739b42c34faf5a9eba3"><code>c64b748</code></a>
Load only .map source maps</li>
<li><a
href="https://github.com/postcss/postcss/commit/aaec7b78b3ce2792585b4b300ef1bd5dd5b3e8ad"><code>aaec7b7</code></a>
Avoid throwing JSON parsing errors for non-JSON source maps</li>
<li><a
href="https://github.com/postcss/postcss/commit/233fb264ea4c37f9e2d7b64b2726e6d23fd02327"><code>233fb26</code></a>
Mention original author of the solution</li>
<li><a
href="https://github.com/postcss/postcss/commit/2502f750307acde733a39f9dfd4ef3cf6c6b734d"><code>2502f75</code></a>
Release 8.5.11 version</li>
<li><a
href="https://github.com/postcss/postcss/commit/5ca19019495b3fa08205f5fd2eeed57892f9fa3d"><code>5ca1901</code></a>
Speed up parsing many nested brackets</li>
<li><a
href="https://github.com/postcss/postcss/commit/42b5337dd7e2fa9a03566495cfad2737eb19e712"><code>42b5337</code></a>
Update dependencies</li>
<li><a
href="https://github.com/postcss/postcss/commit/7e36e153d075ef56ebc352f298b65f646c700a06"><code>7e36e15</code></a>
Cache node.raws locally in Stringifier hot methods</li>
<li>Additional commits viewable in <a
href="https://github.com/postcss/postcss/compare/8.5.6...8.5.12">compare
view</a></li>
</ul>
</details>
<br />


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docs/yarn.lock

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@@ -11491,13 +11491,13 @@ __metadata:
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 "postcss@npm:^8.4.21, postcss@npm:^8.4.24, postcss@npm:^8.4.33, postcss@npm:^8.5.4":
-  version: 8.5.6
-  resolution: "postcss@npm:8.5.6"
+  version: 8.5.12
+  resolution: "postcss@npm:8.5.12"
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     picocolors: "npm:^1.1.1"
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   languageName: node
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yarn.lock

@@ -5881,14 +5881,14 @@ __metadata:
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 "ajv@npm:^6.12.4":
-  version: 6.14.0
-  resolution: "ajv@npm:6.14.0"
+  version: 6.15.0
+  resolution: "ajv@npm:6.15.0"
   dependencies:
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     fast-json-stable-stringify: "npm:^2.0.0"
     json-schema-traverse: "npm:^0.4.1"
     uri-js: "npm:^4.2.2"
-  checksum: 10/c71f14dd2b6f2535d043f74019c8169f7aeb1106bafbb741af96f34fdbf932255c919ddd46344043d03b62ea0ccb319f83667ec5eedf612393f29054fe5ce4a5
+  checksum: 10/0916dda09c152fb5857bc1cc7ce61718e9cec5b7faeff44a74f5e324eed8a556e1a84856724ea322a067b436ecad9f74ac8295fd395449788cca52f0c25bd5fb
   languageName: node
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